<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    body {
        background-color: #f0f0f0;
        font-family: Arial, sans-serif;
        text-align: center;
        padding: 20px;
    }

    h2 {
        color: #333;
    }

</style>

<body>
    <h2>This is 3.html</h2>
</body>
<script>
    console.log('hello world');
    console.log('hello world');
</script>
</html>